chromeos: Replace user image notifications with observer

components/user_manager/user_manager_base.cc

Index: components/user_manager/user_manager_base.cc
diff --git a/components/user_manager/user_manager_base.cc b/components/user_manager/user_manager_base.cc
index 2c7b3ffddaff6b26cf2afabb450f9794db72702e..cc094666da12964877cc33830038c7ff38980c46 100644
--- a/components/user_manager/user_manager_base.cc
+++ b/components/user_manager/user_manager_base.cc
@@ -669,6 +669,26 @@ void UserManagerBase::NotifyLocalStateChanged() {
     observer.LocalStateChanged(this);
 }
 
+void UserManagerBase::NotifyUserImageChanged(const User& user) {
+  DCHECK(task_runner_->RunsTasksOnCurrentThread());
+  for (auto& observer : observer_list_)
+    observer.OnUserImageChanged(user);
+}
+
+void UserManagerBase::NotifyUserProfileImageUpdateFailed(const User& user) {
+  DCHECK(task_runner_->RunsTasksOnCurrentThread());
+  for (auto& observer : observer_list_)
+    observer.OnUserProfileImageUpdateFailed(user);
+}
+
+void UserManagerBase::NotifyUserProfileImageUpdated(
+    const User& user,
+    const gfx::ImageSkia& profile_image) {
+  DCHECK(task_runner_->RunsTasksOnCurrentThread());
+  for (auto& observer : observer_list_)
+    observer.OnUserProfileImageUpdated(user, profile_image);
+}
+
 bool UserManagerBase::CanUserBeRemoved(const User* user) const {
   // Only regular and supervised users are allowed to be manually removed.
   if (!user || !(user->HasGaiaAccount() || user->IsSupervised()))